Segment memory and shared memory

hi guys
is it possible to know the path of "Segment memory and shared memory " on OS level...........
i don't know exact forum for this question so i post it here
please help me !

If are you using Linux you can use ipcs to get all shared memory segments at system level:
$ ipcs -m
------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status
0x0000f47a 65536      root      777        512000     4
0x26278554 163842     oracle    640        132120576 16
0xac004cf0 196611     oracle    660        16108224512 128The Oracle executable sysresv uses ORACLE_SID env. var to map shared memory segment to the current instance:
$ sysresv
IPC Resources for ORACLE_SID "XXX1" :
Shared Memory:
ID              KEY
196611          0xac004cf0
Semaphores:
ID              KEY
229377          0x2dac12a4
Oracle Instance alive for sid "XXX1"

Similar Messages

SHARED MEMORY AND DATABASE MEMORY giving problem.

Hello Friends,
I am facing problem with EXPORT MEMORY and IMPORT MEMORY.
I have developed one program which will EXPORT the internal table and some variables to the memory.This program will call another program via background job. IMPORT memory used in another program to get the first program data.
This IMPORT command is working perfect in foreground. But it is not working in background.
So, I have reviewed couple of forums and I tried both SHARED MEMORY AND DATABASE MEMORY. But no use. Still background is giving problem.
When I remove VIA JOB parameter in the SUBMIT statement it is working. But i need to execute this program in background via background job. Please help me . what should I do?
pls find the below code of mine.
option1
EXPORT TAB = ITAB
       TO DATABASE indx(Z1)
            FROM   w_indx
            CLIENT sy-mandt
            ID     'XYZ'.
option2
EXPORT ITAB   FROM ITAB
TO SHARED MEMORY indx(Z1)
FROM w_indx
CLIENT sy-mandt
ID 'XYZ'.
   SUBMIT   ZPROG2   TO SAP-SPOOL
                  SPOOL PARAMETERS print_parameters
                   WITHOUT SPOOL DYNPRO
      *_VIA JOB name NUMBER number*_
                   AND RETURN.
===
Hope every bidy understood the problem.
my sincere request is ... pls post only relavent answer. do not post dummy answer for points.
Thanks
Raghu

Hi.
You can not exchange data between your programs using ABAP memory, because this memory is shared between objects within the same internal session.
When you call your report using VIA JOB, a new session is created.
Instead of using EXPORT and IMPORT to memory, put both programs into the same Function Group, and use global data objects of the _TOP include to exchange data.
Another option, is to use SPA/GPA parameters (SET PARAMETER ID / GET PARAMETER ID), because SAP memory it is available between all open sessions. Of course, it depends on wich type of data you want to export.
Hope it was helpful,
Kind regards.
F.S.A.

What is semaphore and shared memory

Hello Gurus,
what is Semaphores and shared memory. what is the use of setting the parameter
SHMMAX
SHMMIN
SEMMIN while installing Oracle software in Linux
Regards
Hameed

Hello,
I would advise you to review Oracle Metalink Document: Semaphores and Shared Memory - An Overview : Doc ID: Note:153961.1.
https://metalink.oracle.com/metalink/plsql/f?p=130:14:12007188755102069423::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,153961.1,1,1,1,helvetica
Oracle Metalink Document: TECH: Unix Semaphores and Shared Memory Explained Doc ID: Note:15566.1.
https://metalink.oracle.com/metalink/plsql/f?p=130:14:12007188755102069423::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,15566.1,1,1,1,helvetica
Additionally you can review Oracle Metalink Document: Linux: How to Check Current Shared Memory, Semaphore Values Doc ID: Note:226209.1.
https://metalink.oracle.com/metalink/plsql/f?p=130:14:12007188755102069423::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,226209.1,1,1,1,helvetica
Hope it helps.
Adith

Semaphores and shared memory's classes

Hi there,
I looking for the classes used to deal with semaphores and shared memory. Does anyone know which are these classes?
Thanks

The file mapping capability added in 1.4 may result in shared memory but this is not guaranteed. You can use JNI to call some C code which allocates shared memory and then uses the NewDirectByteBuffer method to return a ByteBuffer representing that shared memory to the Java code.
You would also need to use JNI to wrap system provided semaphore or mutex operations to provide cross process synchronization.
However, do your communication needs really require performance in excess of that available using sockets? I can get at least 7MB/s between two processes on a rather modest machine.

In OSX Activity Monitor, what's the difference between 'free' memory and 'inactive' memory

In OS X Activity Monitor, what's the difference between 'free' memory and 'inactive' memory. My daughters 2Gb MacBook Pro is very slow, it probably needs more memory but there is almost 1Gb of 'inactive' memory but no 'free' memory when an application is opened.
Thanks

Free RAM is the one that has not been used by any application since you started up your Mac, and inactive RAM is the one that was used by an application and it is not in use anymore.
1 GB of inactive RAM is a lot, and it may be the cause of the slowness. There are a lot of apps that allows you to turn inactive into free RAM. I use FreeMemory, but have a look at the Mac App Store.
If you are a developer, you can do that with a command you can type into Terminal:
sudo purge

Examples for SAP Memory and ABAP Memory

Hi all,
can u give me one example of sap memory and abap memory.
Ranjith

Hi,
SAP Memory
SAP memory is a memory area to which all main sessions within a SAPgui have access. You can use SAP memory either to pass data from one program to another within a session, or to pass data from one session to another. Application programs that use SAP memory must do so using SPA/GPA parameters (also known as SET/GET parameters). These parameters can be set either for a particular user or for a particular program at the time of logon using the SET PARAMETER statement. Other ABAP programs can then retrieve the set parameters using the GET PARAMETER statement. The most frequent use of SPA/GPA parameters is to fill input fields on screens .
example:
ABAP programs can access the parameters using the SET PARAMETER and GET PARAMETERstatements.
To fill one, use:
SET PARAMETER ID pid FIELD f
This statement saves the contents of field f under the ID pid in the SAP memory. The ID pid can be up to 20 characters long. If there was already a value stored under pid, this statement overwrites it. If you double-click pid in the ABAP Editor, parameters that do not exist can be created as a Repository object.
To read an SPA/GPA parameter, use:
GET PARAMETER ID pid FIELD f.
This statement places the value stored under the pid ID into the variable f. If the system does not find any value for pid in the SAP memory, sy-subrc is set to 4. Otherwise, it sets the value to 0.
ABAP Memory
ABAP memory is a memory area that all ABAP programs within the same internal session can access using the EXPORT and IMPORT statements. Data within this memory area remains throughout a sequence of program calls, with the exception of LEAVE TO TRANSACTION. To pass data to a program that you are calling, the data needs to be placed in ABAP memory before the call is made from the internal calling session using the EXPORT statement. The internal session of the called program then replaces that of the calling program. The program called can then read from the ABAP memory using the IMPORT statement. If control is then returned to the program that made the initial call, the same procedure operates in reverse.If a transaction is called using LEAVE TO TRANSACTION, the ABAP memory and the call stack are deleted. They cannot be used for data transfer.
Since objects belonging to ABAP objects can only be accessed within an internal session, it does not make sense and is therefore forbidden (from a syntax point of view) to pass a reference to an object to a calling program through the ABAP memory.
Example:
Export hello to memory id 'Hello_world'.
Import hello from memory id 'Hello_world'
Regards
Sudheer

Hi Friends ....Difference between SAP memory and ABAP memory

Hi Friends,
I faced a interview and they ask this question
What is the difference between SAP Memory and ABAP memory..

conti
SAP Memory
SAP memory is a memory area to which all main sessions within a SAPgui have access. You can use SAP memory either to pass data from one program to another within a session, or to pass data from one session to another. Application programs that use SAP memory must do so using SPA/GPA parameters (also known as SET/GET parameters). These parameters can be set either for a particular user or for a particular program using the SET PARAMETER statement.
Other ABAP programs can then retrieve the set parameters using the GET PARAMETER statement. The most frequent use of SPA/GPA parameters is to fill input fields on screens.
ABAP Memory
ABAP memory is a memory area that all ABAP programs within the same internal session can access using the EXPORT and IMPORT statements. Data within this area remains intact during a whole sequence of program calls. To pass data to a program which you are calling, the data needs to be placed in ABAP memory before the call is made. The internal session of the called program then replaces that of the calling program. The program called can then read from the ABAP memory. If control is then returned to the program which made the initial call, the same process operates in reverse.
A simple example of ABAP memory is using the EXPORT/IMPORT statements.
Here in this program, I get the data, export it to memory,
clear out the internal table in my progam, then reimport the data into it and write out the data.
You probably wounldn't do this in a normal program,
but this is how you can pass data from program a to program b when A Submits program B.
report zxy_0002 .
data: it001 type table of t001 with header line.
select * into table it001 from t001.
export it001 = it001 to memory id 'ZXY_TEST'.
clear it001. refresh it001.
import it001 = it001 from memory id 'ZXY_TEST'.
loop at it001.
write:/ it001-bukrs, it001-butxt.
endloop.
SAP Memory
SAP memory is a memory area to which all main sessions within a SAPgui have access.
You can use SAP memory either to pass data from one program to another within a session,
or to pass data from one session to another.
Application programs that use SAP memory must do so using SPA/GPA parameters (also known as SET/GET parameters).
These parameters can be set either for a particular user
or for a particular program using the SET PARAMETER statement.
Other ABAP programs can then retrieve the set parameters using the GET PARAMETER statement.
The most frequent use of SPA/GPA parameters is to fill input fields on screens
ABAP/4 Memory
ABAP memory is a memory area that all ABAP programs within the same internal session can access
using the EXPORT and IMPORT statements.
Data within this area remains intact during a whole sequence of program calls. To pass data
to a program which you are calling,
the data needs to be placed in ABAP memory before the call is made.
The internal session of the called program then replaces that of the calling program.
The program called can then read from the ABAP memory.
If control is then returned to the program which made the initial call, the same process operates in reverse.
SAP memory
The SAP memory, otherwise known as the global memory,
is available to a user during the entire duration of a terminal session.
Its contents are retained across transaction boundaries as well as external and internal sessions.
The SET PARAMETER and GET PARAMETER statements allow you to write to, or read from, the SAP memory.
ABAP/4 memory
The contents of the ABAP/4 memory are retained only during the lifetime of an external session
(see also Organization of Modularization Units).
You can retain or pass data across internal sessions.
The EXPORT TO MEMORY and IMPORT FROM MEMORY statements allow you to write data to, or read data from, the ABAP memory.
ABAP Memmory & SAP Memmory
http://www.sap-img.com/abap/difference-between-sap-and-abap-memory.htm
http://www.sap-img.com/abap/type-and-uses-of-lock-objects-in-sap.htm
Set
http://www.geocities.com/SiliconValley/Campus/6345/set_para.htm
GET
http://www.geocities.com/SiliconValley/Campus/6345/get_para.htm
EXPORT
http://www.geocities.com/SiliconValley/Campus/6345/export01.htm
Other Imp Help
http://www.geocities.com/SiliconValley/Campus/6345/abapindx.htm

Hi All,Can any provide an example for SAP MEMORY AND ABAP memory

Hi All,
Can any provide me an example for SAP MEMORY AND ABAP memory.
thanks&regards.
Bharat.

HI Bharat
A simple example of ABAP memory is using the EXPORT/IMPORT statements.
Here in this program, I get the data, export it to memory,
clear out the internal table in my progam, then reimport the data into it and write out the data.
You probably wounldn't do this in a normal program,
but this is how you can pass data from program a to program b when A Submits program B.
report zxy_0002 .
data: it001 type table of t001 with header line.
select * into table it001 from t001.
export it001 = it001 to memory id 'ZXY_TEST'.
clear it001. refresh it001.
import it001 = it001 from memory id 'ZXY_TEST'.
loop at it001.
write:/ it001-bukrs, it001-butxt.
endloop.
SAP Memory
SAP memory is a memory area to which all main sessions within a SAPgui have access.
You can use SAP memory either to pass data from one program to another within a session,
or to pass data from one session to another.
Application programs that use SAP memory must do so using SPA/GPA parameters (also known as SET/GET parameters).
These parameters can be set either for a particular user
or for a particular program using the SET PARAMETER statement.
Other ABAP programs can then retrieve the set parameters using the GET PARAMETER statement.
The most frequent use of SPA/GPA parameters is to fill input fields on screens
ABAP/4 Memory
ABAP memory is a memory area that all ABAP programs within the same internal session can access
using the EXPORT and IMPORT statements.
Data within this area remains intact during a whole sequence of program calls. To pass data
to a program which you are calling,
the data needs to be placed in ABAP memory before the call is made.
The internal session of the called program then replaces that of the calling program.
The program called can then read from the ABAP memory.
If control is then returned to the program which made the initial call, the same process operates in reverse.
SAP memory
The SAP memory, otherwise known as the global memory,
is available to a user during the entire duration of a terminal session.
Its contents are retained across transaction boundaries as well as external and internal sessions.
The SET PARAMETER and GET PARAMETER statements allow you to write to, or read from, the SAP memory.
ABAP/4 memory
The contents of the ABAP/4 memory are retained only during the lifetime of an external session
(see also Organization of Modularization Units).
You can retain or pass data across internal sessions.
The EXPORT TO MEMORY and IMPORT FROM MEMORY statements allow you to write data to, or read data from, the ABAP memory.
ABAP Memmory & SAP Memmory
http://www.sap-img.com/abap/difference-between-sap-and-abap-memory.htm
http://www.sap-img.com/abap/type-and-uses-of-lock-objects-in-sap.htm
Set
http://www.geocities.com/SiliconValley/Campus/6345/set_para.htm
GET
http://www.geocities.com/SiliconValley/Campus/6345/get_para.htm
EXPORT
http://www.geocities.com/SiliconValley/Campus/6345/export01.htm
http://help.sap.com/saphelp_nw04/helpdata/en/fc/eb3bc4358411d1829f0000e829fbfe/frameset.htm
Other Imp Help
http://www.geocities.com/SiliconValley/Campus/6345/abapindx.htm
Regards Rk

Is there any difference between DDR3 memory and LPDDR3 memory? As i brought my macbook air 2013 recently and i saw the specifications it is indicating DDR3, buy apple website stated LPDDR3. Anyone can advise on this?

Hi
Is there any difference between DDR3 memory and LPDDR3 memory? As i brought my macbook air 2013 recently and i saw the specifications in the system info that is indicating DDR3, but apple website stated LPDDR3. Anyone can advise on this?

Welcome to Apple Support Communities
Read > http://en.wikipedia.org/wiki/Mobile_DDR DDR is the RAM used in computers, and LPDDR is common in mobile computers

Solaris 10, Oracle 10g, and Shared Memory

Hello everyone,
We've been working on migrating to Solaris 10 on all of our database servers (I'm a UNIX admin, not a DBA, so please be gentle) and we've encountered an odd issue.
Server A:
Sun V890
(8) 1.5Ghz CPUs
32GB of RAM
Server A was installed with Solaris 10 and the Oracle data and application files were moved from the old server (the storage hardware was moved between servers). Everything is running perfectly, and we're using the resource manager to control the memory settings (not /etc/system)
The DBAs then increase the SGA of one of the DBs on the system from 1.5GB to 5GB and it fails to start (ORA-27102). According to the information I have, the maximum shared memory on this system should be 1/4 of RAM (8 GB, actually works out to 7.84 GB according to prctl). I verified the other shared memory/semaphore settings are where they should be, but the DB would not start with a 5 GB SGA. I then decided to just throw a larger max shared memory segment at it, so I used the projmod to increase project.max-shm-memory to 16GB for the project Oracle runs under. The DB now starts just fine. I cut it back down to 10GB for project.max-shm-memory and the DB starts ok. I ran out of downtime window, so I couldn't continue refining the settings.
Running 'ipcs -b' and totalling up the individual segments showed we were using around 5GB on the test DB (assuming my addition is correct).
So, the question:
Is there a way to correlate the SGA of the DB(s) into what I need the project.max-shm-memory to? I would think 7.84GB would be enough to handle a DB with 5GB SGA, but it doesn't appear to be. We have some 'important' servers getting upgraded soon and I'd like to be able to refine these numbers / settings before I get to them.
Thanks for your time,
Steven

To me, setting a massive shared memory segment just seems to be inefficient. I understand that Oracle is only going to take up as much memory (in general) as the SGA. And I've been searching for any record of really large shared memory segments causing issues but haven't found much (I'm going to contact Sun to get their comments).
The issue I am having is that it doesn't make sense that the DB with a 5GB SGA is unable to startup when there is an 8GB max shared memory segment, but a 10GB (and above) seems to work. Does it really need double the size of the SGA when starting up, but 'ipcs' shows it's only using the SGA amount of shared memory? I have plans to cut it down to 4GB and test again, as that is Oracle's recommendation. I also plan to run the DB startup through truss to get a better handle on what it's trying to do. And, if it comes down to it, I'll just set a really big max shared memory segment, I just don't want it to come back and cause an issue down the road.
The current guidance on Metalink still seems to be suggesting a 4GB shared memory segment (I did not get a chance to test this yet with the DB we're having issues with).
I can't comment on how the DBA specifically increased the SGA as I don't know what method they use.

ORA-01031: insufficient privileges and shared memory realm does not exist

Hi all,
I came to a dead end to start oracle 10.2 database. I have searched on google and this forum, none of these solutions work for me. PS, I have installed 11g on my machine too.
I have set up ORACLE_SID,ORACLE_HOME to 10.2 database based on the tnsnames.ora.
follow is error message：
sqlplus sys as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Wed Apr 3 02:09:54 2013
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-01031: insufficient privileges
sqlplus /nolog
SQL*Plus: Release 10.2.0.1.0 - Production on Wed Apr 3 02:10:55 2013
Copyright (c) 1982, 2005, Oracle. All rights reserved.
SQL> conn / as sysdba
ERROR:
ORA-01031: insufficient privileges
SQL> conn scott/tiger
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux-x86_64 Error: 2: No such file or directory
First I thought the instance has been start yet, but since I can't login with sysdba. I don't know what other options.
For 10.2, the tnsnames.ora
ORA102 =
+(DESCRIPTION =+
+(ADDRESS = (PROTOCOL = TCP)(HOST =XXX)(PORT = 1523))+
+(CONNECT_DATA =+
+(SERVER = DEDICATED)+
+(SERVICE_NAME = ora102)+
+)+
+)+
LISTENER_ORA102 =
+(ADDRESS = (PROTOCOL = TCP)(HOST =XXX)(PORT = 1523))+
EXTPROC_CONNECTION_DATA =
+(DESCRIPTION =+
+(ADDRESS_LIST =+
+(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC2))+
+)+
+(CONNECT_DATA =+
+(SID = PLSExtProc)+
+(PRESENTATION = RO)+
+)+
+)+
listener.ora:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /data/oracle/ora102)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC2))
(ADDRESS = (PROTOCOL = TCP)(HOST =XXXXX)(PORT = 1523))
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)

try do this steps on server side:
1) sqlplus sys as sysdba
2) select open_mode from v$database;
show result 2 step

Migration 8i to 9iR2 and "Shared Memory Realm does not exist"

Dear Experts,
I read from Note 159657.1 in step 22
If you are using a passwordfile set the parameter
REMOTE_LOGIN_PASSWORDFILE=NONE (If you are using windows also set the
parameter SQLNET.AUTHENTICATION_SERVICES=(NTS) in the sqlnet.ora file.
The issue is I can't restart my instance in step 32 (same note) because I need to have SQLNET.AUTHENTICATION_SERVICES=(NONE) since we migrated to Active Directory.
So...is this setting to (NTS) mandatory before migrating my database ? If Yes Should I simply set it to NTS and then set it back to NONE before re-strating my database ?
Thanks for any advice.
Regards,
Guillaume

Hi,
"Shared Memory Realm does not exist" error might come from some initialization parameter in init.ora file not set properly most probably these are "memory" related parameters. init.ora file was configured with diffirent memory value.
Data sheet

FOTRAN and Shared Memory

I'm currently working with a large simulation involving mixed language Fortran and C executable programs (like 10 different executables running
together in real-time).
I now need to port the code from SUN-3 (SunOS 4.0) over to a modern Enterprise 250 server. Since I' porting I'd like to have the multitude of executables to use the POSIX compliant calls shm_open and mmap to map the appropriate common blocks. Unfortunately, my search of Dejanews and other internet sources have shown this to be a widely debated topic without much in the way of answers.
So far, I've written fortran callable c-stubs to do the shm_open and mmap calls but I can't get mmap to successfully take the address I specify. Also since the other fortran programs will have copies of the same common blocks the obvious interface issue comes up, how to I map onto the same common block (shared memory region) for all programs?
My target platform is UltraSparc II running Solaris 2.7. Any hints?

One possible problem is that Fortran passes everything by reference (by
default) and the C routines that you are calling may want some of the
data to be passed by value.
Another could be that the mmap doesn't want to remap the common blocks
if they are already mapped. If that is the case, you can try mapping unused
space and then using either Fortran 95 (preferred) or Cray pointers to point
to the space. If you make it work with Fortran 95 pointers, you won't even
need much in the way of syntax changes in your program.

What's the difference between free memory and inactive memory?

In activity monitor it mostly shows my having a lot of inactive memory and a lot less free memory even when I'm only running Safari for instance. What is this inactive memory and why is not available?

This is a very informative article:
http://docs.info.apple.com/article.html?artnum=107918

Format C7 - Mass Memory and Phone Memory

Hi ,
I am trying to format my phone ( C 7 ) , I tried several way such pressing the three buttons ( camera , menue and low volume ) and it works . Also , i tried with the comination numbers *# ....
and it works alos , BUT the problem is i still have the data in the mass memory and the phone memory . I don't know how to keep my phone clean out of these data ...???!!!
Pllllllllllleeeeeeeeeeeeeeeeas help me

Thanks guys ,
Currently , E : mass memory has free space around 7.4 GB , and C: drive has only 458 MB !! I remeber it could be higher than that if we format the phone somwhow . If I go to Details in C drive it shows 32 MB Memory in use , and 32 MB OTher files !!!
Where did they come from ???
The problem is I want to sell my phone and I wanna make sure it has nothing left from my data such as pictures , sounds ...etc
Also, once I format it , it becomes dull ( ugly ) ..only black screens !!!! where is the motions and effect ??
How can upgrade the frameware ??
Currently here is the data has
Release : Symbian Anna
Software version : 024.001
Software version date :29-07-2011
Custom version : 024.001.13.01
Product code :059B7V7
Browser version : 7.3
Can I make it better ??
Pleeeeeeeeas help

Segment memory and shared memory

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